How did Gutenberg's printing press change the way books were pro

How did Gutenberg's printing press change the way books were produced before its invention?
A、Books were written by hand, making them rare and expensive.
B、Books were printed using a casting method similar to pottery.
C、Books were printed using a mechanical press similar to a modern-day photocopier.
D、Books were not produced at all before Gutenberg's invention.
【正确答案】：A
【题目解析】：Books were written by hand, making them rare and expensive.